<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>

<body>
    <video width="400" height="300" autoplay id="player" style="background-color: black;"></video>
    <div>
        <button id="btn-record">Start Record</button>
        <button id="btn-stop">Stop Record</button>
        <button id="btn-play">Play</button>
    </div>

    <script src="app.js"></script>
</body>

</html>